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Nuclear reactors can be monitored by measuring the large number of antineutrinos they produce. Antineutrinos are subatomic particles that are impossible to shield and provide clues to a reactor’s current operating status and power level, potentially a long distance from the reactor. This gives the United States insight into a reactor’s plutonium production potential. Learn more: https://nnsa.energy.gov/blo...
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As part of NNSA's mission to extend the lifetime of nuclear weapons in the stockpile, the ASC program provides NNSA with leading edge, high-end simulation capabilities. The ASC program helps NNSA meet nuclear weapons assessment and certification requirements, including: weapon codes, weapon science, computing platforms and supporting infrastructure.

NNSA's three national laboratories house four of the world's fastest supercomputers: the BlueGene/L at Lawrence Livermore National Laboratory, the Red Storm at Sandia National Laboratories, and Roadrunner and Cielo at Los Alamos National Laboratory.